The Two-Dimensional Ising Model

• White (Blue) are spin state S_i=-1 (1) on each site.
• The magnetization, M, is the mean of all spins.
• The energy E=-Sum_<i,j>S_iS_j. <i,j> symbolizes sum over nearest neighbor pairs only.
• At T >> T_critical, the energy per spin is zero.
• At T=O K, all the spins are parallel and the energy per spin is -2.
• Control the temperature either by typing a (positive) real number into the temperature field followed by a carriage return or by adjusting the thermometer with the mouse.
• T_Initial = T_critical= 2/ln(1+sqrt2) = 2.269.

Acknowledgement: Our updated JAVA 2 version (and JAVA 1 compatible) of one obtained from Peter Young , UCSC, that he modified from Bernd Nottelmann at Muenster.   
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